聚吡咯
材料科学
化学工程
锂(药物)
电催化剂
吸附
纳米技术
复合数
异质结
阴极
聚合物
电极
化学
聚合
复合材料
电化学
有机化学
光电子学
物理化学
内分泌学
工程类
医学
作者
Yanqi Feng,Hui Liu,Qiongqiong Lu,Yi Liu,Junqi Li,Xiangming He,Xiaoxu Liu,Daria Mikhailova
标识
DOI:10.1016/j.jpowsour.2021.230885
摘要
Efficiency of entrapping and conversion toward lithium polysulfides (LiPSs) plays a key role in promoting the utilization of sulfur and regulating LiPSs redox in lithium-sulfur (Li–S) batteries. However, a well-designed electrocatalyst with abundant active centers to facilitate conversion of LiPSs and prolong the lifespan of Li–S batteries is still required. Herein, a novel heterostructure of polypyrrole (PPy) nanotubes composite with hierarchical MnO (MnO/PPy-2) was designed as a host. N-containing functional groups and p-conjugated structures in PPy and polar MnO supply proper trapping ability toward LiPSs. More polar (=C–N+) and Mn–OH bonds are beneficial for electron transfer on conductive PPy substrate, which guarantee the uniform deposition of Li2S. Moreover, the hierarchical structure provides abundant surface and active sites for LiPSs entrapping and catalyzing, avoiding the electric contact loss. The synergetic merits of proper adsorption and conversion make MnO/PPy-2 composite a competitive host in the Li–S field. The cathode (S–MnO/PPy-2) exhibits a superior rate performance and cycling stability enabling 1000 cycles at 1 C with 0.032% capacity loss per cycle. This work paves a way to fabricate and utilize conductive polymer/metal oxides heterostructures as catalyst in Li–S batteries and provides a new sight to understand catalyst design in energy storage devices.
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